Is the bird actually flying into the glass at full speed, like they do when they don't realize there is glass there? Or is the bird just banging his beak against the window while he is stationary, like he sees his reflection and is trying to play with it, like they do when they have mirrors as toys?
If he's actually flying into the window at full speed all the time I'd be worried he's going to break the window and kill himself in the process. I have a very large, rectangular bay window with two long, skinny windows on either side of it, it's in my living room, right over my front yard, and my couch is directly underneath it. I am constantly having birds fly full tilt into the window, and if I'm on the couch with my back to the window it's quite alarming! I actually had to change my blinds to ones that made it very obvious that there was something there that they couldn't fly through. So if the issue is that they are flying into the window because they can't see it, you need to close your blinds/curtains or possibly try putting something in or on/up against the window that the birds can see so they know they can't fly through it.
If the bird or birds are just playing with the window by banging their beaks against it, it's pretty much the same issue, they see their reflection and think it's another bird. That's why a lot of bird toys have mirrors. My budgies that aren't paired up will often bond with a toy mirror, head bobbing and regurgitating all over it. So to stop this once again you need to put something up/on/against the window to prevent the birds from seeing their reflections.
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